EP3308179B1 - Dispositif de commutation, dispositif de test et procédé pour faire fonctionner un dispositif de commutation pour un appareil de mesure pour un transformateur - Google Patents

Dispositif de commutation, dispositif de test et procédé pour faire fonctionner un dispositif de commutation pour un appareil de mesure pour un transformateur Download PDF

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Publication number
EP3308179B1
EP3308179B1 EP16728018.9A EP16728018A EP3308179B1 EP 3308179 B1 EP3308179 B1 EP 3308179B1 EP 16728018 A EP16728018 A EP 16728018A EP 3308179 B1 EP3308179 B1 EP 3308179B1
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EP
European Patent Office
Prior art keywords
transformer
measuring device
winding
switch apparatus
windings
Prior art date
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Application number
EP16728018.9A
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German (de)
English (en)
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EP3308179A1 (fr
EP3308179C0 (fr
Inventor
Michael Freiburg
Felix FEUSTEL
Horst Schedler
Dmitry Atlas
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Omicron Electronics GmbH
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Omicron Electronics GmbH
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Publication of EP3308179C0 publication Critical patent/EP3308179C0/fr
Publication of EP3308179B1 publication Critical patent/EP3308179B1/fr
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
    • G01R1/206—Switches for connection of measuring instruments or electric motors to measuring loads
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H2009/0061—Monitoring tap change switching devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices

Definitions

  • the invention relates to a switching device for a measuring device for a transformer, a test device with the switching device and a method for operating the switching device.
  • the invention relates in particular to such devices and methods which can be used for measuring devices for voltage converters.
  • Transformers are used as components of energy supply networks, for example for measuring electrical quantities of high potential, for network protection or for voltage conversion, for example for voltage conversion from a first value on a high-voltage side to a second value, which is smaller than the first value, on a low-voltage side.
  • the determination of the plurality of parameters includes a plurality of individual measurements in which an electrical voltage and/or an electrical current is recorded and evaluated. For example, conclusions can be drawn from the measured parameters about the measurement accuracy (measurement or protection class) of the transformer.
  • the external wiring (wiring configuration) of the transformer to be tested varies in the majority of individual measurements, although this is particularly true when using a so-called four-wire or four-wire measurement method.
  • Manual rewiring can involve a lot of work and time and can lead to incorrect, inaccurate or non-reproducible individual measurements. This also applies in particular to the creation of short circuits on the primary side or secondary side of the respective test object, with such short circuits often being necessary depending on the test method used.
  • a switching device for a measuring device for a transformer a test device with the switching device and a method for operating the switching device are specified, which rely on controllable switching means in order to be able to effect an automated change in the wiring configuration between the measuring device and the transformer to be tested.
  • the amount of work and time required and, in particular, such errors and inaccuracies when changing the wiring configuration between the measuring device and the transformer to be tested can be reduced, which manual wiring can entail in a plurality of successive individual measurements.
  • the measurement results can This makes it more reproducible, and increased accuracy can also be achieved when testing the respective transformer.
  • the present invention is preferably suitable for operation with voltage converters.
  • Voltage transformers also known as measuring transformers or protective transformers, are used, for example, to detect potential-free alternating voltages for energy metering or network protection applications.
  • the invention is not limited to this preferred area of application. In principle, the invention can be used for any type of transformer.
  • the switching device comprises controllable switching means, which are designed to short-circuit assigned connections of one of a plurality of windings of the transformer.
  • a winding of a transformer is a coil, i.e. a passive component, which can be characterized primarily by an electrical inductance and also by an ohmic resistance and a parasitic capacitance.
  • connections of a winding can be ends and/or taps of the winding.
  • controllable means that the switching means in question can be operated without manual intervention.
  • a control signal provided for controlling the respective switching means can be generated by the measuring device, so that the wiring configuration can be automatically and flexibly adapted to the respective needs and the test sequences to be carried out via the measuring device, the configuration of the switching device, the generation and application of the respective test signal as well as the tapping and evaluation of the respective measurement signal can be coordinated centrally via the measuring device.
  • the switching device comprises first further controllable switching means, which are designed to supply a first electrical quantity to be provided by the measuring device as a test signal to the transformer to a respectively assigned connection of one of the plurality of windings.
  • the first electrical quantity can be an electrical potential or an electrical current. It can be an alternating quantity or a constant quantity.
  • the switching device comprises second, further controllable switching means, which are designed to deliver a second electrical variable to be detected by the measuring device as a measurement signal from a respectively assigned connection of one of the plurality of windings.
  • the second electrical quantity can also be an electrical potential or an electric current as well as an alternating quantity or a constant quantity.
  • a difference between two electrical potentials is an electrical voltage. This can be between two connections of a relevant winding or a connection of this winding and the ground potential.
  • controllable switching means can be set up to short-circuit associated connections of a secondary side of the plurality of windings with a low resistance with an ohmic resistance of less than 10 ⁇ , preferably less than 1 ⁇ and particularly preferably less than 1 m ⁇ .
  • the secondary-side winding corresponds in particular to a low-voltage side of the transformer, which carries a low voltage.
  • controllable switching means can also be set up to provide assigned connections to a primary side of the plurality of windings with an ohmic resistance of less than 50% of a winding resistance of the same, preferably less than 1 ⁇ and particularly preferably less than 1 m ⁇ , to short-circuit with low resistance.
  • the primary-side winding corresponds in particular to an upper-voltage side of the transformer that carries a high voltage.
  • the controllable switching means can also be set up to double short-circuit the respectively assigned connections of the respective primary or secondary transformer winding.
  • the corresponding short circuit can be carried out, for example, via corresponding switching means in a first module, in particular a low-voltage module, and additionally via corresponding switching means in a second module, in particular a high-voltage module. This prevents a faulty short circuit from causing dangerous potential in the switching device.
  • the respective transformer can be operated in particular as a step-up converter.
  • a few volts at the input can result in a few kilovolts on the primary side.
  • the kilovolts are present in the switching matrix formed by the controllable switching means described.
  • a transformer connected in parallel to the short circuit with a redundant short circuit on the "other" side can therefore provide redundant protection for the short circuit.
  • the individual controllable switching means can each be circuit breakers.
  • Circuit breakers are special switches that are designed to switch a load circuit under the control of a control circuit.
  • the controllable switching means can each be or include high-voltage relays, bipolar transistors with insulated control electrodes (IGBT) or field effect transistors (FET).
  • IGBT insulated control electrodes
  • FET field effect transistors
  • the majority of the windings of the transformer can also include partial windings.
  • the switching device can be integrated into the measuring device, so that the switching device is housed in a common housing with the test signal signal source and the measurement signal evaluation unit of the measuring device.
  • the switching device and the measuring device can also be provided in separate housings.
  • the separate switching device can be positioned in the field, particularly in the high-voltage area, near the transformer to be tested, while the measuring device can be operated in the safe area outside the high-voltage environment.
  • a test device comprises a switching device according to one of the previously described embodiments and a measuring device for a transformer.
  • a method for operating a switching device for a measuring device for a transformer includes short-circuiting respectively assigned connections of a winding from a plurality of windings of the transformer with the aid of controllable switching means.
  • the method can be carried out with the switching device or the test device according to one of the previously described exemplary embodiments.
  • the devices and methods according to embodiments of the invention can automatically provide different wiring configurations between a transformer measuring device and the transformer to be tested.
  • Various advantages can be realized. In particular, work and time expenditure as well as errors and inaccuracies can be reduced when changing the wiring configuration between the measuring device and the transformer to be tested, which manual wiring can entail in a plurality of successive individual measurements. This makes the measurement results more reproducible.
  • Transformers with a variety of different designs are used in practice.
  • the properties of the transformers vary accordingly.
  • the devices and methods according to exemplary embodiments of the invention enable simple testing of a large variety of different transformers with a variety of different designs, with extensive automation of transformer testing being possible.
  • Connections and couplings between functional units and elements shown in the figures can also be implemented as an indirect connection or coupling.
  • a connection or coupling can be implemented in a wired or wireless manner.
  • the transformer can be, for example, a transformer for high or medium voltage networks.
  • the transformer can also be, for example, a transformer installed in a power plant or substation.
  • the device can be a mobile device that allows an on-site test to be carried out on an installed transformer.
  • Figure 1 shows a switching device 10 according to an exemplary embodiment.
  • a plurality of connections 11 led out of the switching device 10 can be seen, which are used to connect windings of a transformer to be tested, the transformer in particular being a voltage converter and its several windings can also be partial windings.
  • the exemplary embodiment includes a connection position 12 for a primary-side winding and three connection positions 13 for several secondary-side windings that can be connected at the same time. All windings are, for example, passed through by the same magnetic flux, as indicated by the two vertical parallels.
  • the switching device 10 points on the left side of the Figure 1 controllable switching means 14, which are designed to short-circuit the respectively assigned connections 11 of one of the plurality of windings of the transformer.
  • controllable switching means 14 can short-circuit the connections 11 assigned to them with low resistance. While this may require an ohmic resistance of less than 10 ⁇ , preferably less than 1 ⁇ and particularly preferably less than 1 m ⁇ , for secondary-side windings connected to connection positions 13, an ohmic short-circuit resistance is preferred for primary-side windings connected to connection position 12 of less than 50% of the winding resistance of the same, preferably less than 1 ⁇ and particularly preferably less than 1 m ⁇ .
  • connection 15 are high-voltage side connections, while the connections 16 are low-voltage side connections.
  • the switching device 10 has first further controllable switching means 17, which are designed to supply the test signal provided at a respective connection 15, 16 to a respectively assigned connection 11 of one of the plurality of windings.
  • the connections 11 of the secondary-side connection positions 13 can each be flexibly connected to one of the two connections 16.
  • a block 18 is also indicated, which is used to generate a high-voltage test signal.
  • This block can be inserted into the switching device 10 or into the associated one (and in Fig. 1 measuring device (not shown) can be integrated.
  • the section 18 is a separate component, which is to be connected to the measuring device and the switching device 10.
  • the block 18 can be short-circuited twice, both on the side of the connections 11 and, for safety reasons, on the side of the connections 15, each with a controllable switching means 14. As a result, the connections 11 assigned to the primary windings can be short-circuited twice.
  • Second electrical variables which are preferably also currents or electrical voltages, can be sent out of the switching device 10 and supplied to the measuring device as measurement signals.
  • the switching device 10 comprises second further controllable switching means 20 between the connections 11 of the secondary-side connection positions 13 and the connections 19, which are set up to connect a respective assigned connection 11 to a respective predetermined connection 19.
  • the connections 11 can each be flexibly connected to a predetermined one of two possible connections 19.
  • the controllable switching means 14, 17 and 20 can each be circuit breakers.
  • control signals S which are preferably provided by the measuring device.
  • control signals S which are preferably provided by the measuring device.
  • different test configurations can be set using these control signals S by short-circuiting the required windings of the test object on the switching device 10 and the test signals can be fed to the desired primary or secondary side connections or the measurement signals can be tapped from the desired primary or secondary side connections.
  • Figure 2A illustrates exemplary winding connections of a transformer having a primary-side and two secondary-side windings.
  • Figure 2B also shows exemplary winding connections of a transformer having a primary-side and two secondary-side windings.
  • the two secondary-side windings of this transformer are actually partial windings of a single secondary-side winding with a tap present between the partial windings. Accordingly, the two partial windings share a common connection 11.
  • any primary or secondary side connections of the transformer to be tested can be short-circuited via the controllable switching means 14.
  • any of the test signal connections 15, 16 can be connected to any primary or secondary side connections of the transformer via the controllable switching means 17, while any of the measurement signal connections 19 can be coupled to any primary or secondary side connections of the transformer via the controllable switching means 20 .
  • FIG 3 shows an exemplary embodiment in which the switching device 10 is integrated into the associated measuring device 30.
  • the measuring device 30 and the switching device 10 thus share a common housing and form a common structural unit.
  • the housing integration makes it possible to avoid sources of errors and dangers in the wiring between the measuring device 30 and the switching device 10.
  • Figure 4 shows a test device 40 or test environment according to a further exemplary embodiment.
  • the test device 40 includes the transformer measuring device 30, with the switching device 10 and the measuring device 30 each being accommodated in their own housings and thus forming separate units, which means High voltage applications can be advantageous.
  • the separate switching device 10 can then be positioned in the field, particularly in the high-voltage area, near the transformer to be tested, while the measuring device 30 can be operated in the safe area outside the high-voltage environment.
  • Figure 5 shows a flowchart of a method 50 according to an exemplary embodiment.
  • the method 50 is used to operate a switching device 10 of the type described above with a measuring device 30 for a transformer.
  • the method 50 uses controllable switching means 14, which are designed to short-circuit assigned connections 11 of one of a plurality of windings of the transformer.
  • the method also uses first further controllable switching means 17, which are set up to supply a first electrical variable, preferably to be provided by the measuring device 30, as a test signal to a respectively assigned connection 11 of one of the plurality of windings.
  • the method 50 uses second, further controllable switching means 20, which are set up to deliver a second electrical quantity, preferably to be detected by the measuring device 30, as a measurement signal from a respectively assigned connection 11 of one of the plurality of windings.
  • the method 50 includes the following steps.
  • a first step 51 the respectively assigned connections 11 of one of the plurality of windings of the transformer are short-circuited via the controllable switching means 14.
  • the first electrical variable is supplied as a test signal to a respective assigned connection 11 of one of the plurality of the windings after the controllable switching means 17 have been adjusted accordingly.
  • the second electrical variable is removed or tapped as a measurement signal from a respectively assigned connection 11 of one of the plurality of windings after the controllable switching means 20 have been set accordingly.
  • the method 50 can be carried out with any switching device 10 according to one of the previously described exemplary embodiments or the test device 40 according to the above exemplary embodiment.
  • the invention has been described with reference to voltage converters, the invention can be generally applied to transformers of any type.
  • controllable switching means 14, 17 and 20 do not all have to be implemented.
  • the advantage of the automatable configuration can already be achieved if only individual switching means of the controllable switching means 14, 17 and 20 are provided in order to selectively short-circuit individual winding connections 11 of the test object and/or selectively with a test signal output 15, 16 or a measurement signal. To be able to connect input 19 of the measuring device.
  • transformer can be installed in a power plant or substation of an energy supply network
  • devices and methods according to embodiments of the invention can also be used in smaller transformers.
  • controllable switching means 14, 17 and 20 and the switching matrix realized thereby can also be used to connect several windings of the test object or transformer, in particular several secondary windings, in series.
  • This measure allows the inductance of the transformer to be “artificially” increased, which in turn means that a lower current is required for measurement, so that a lower output power of the measuring device and smaller switching devices (e.g. smaller relays) are possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Testing Relating To Insulation (AREA)

Claims (15)

  1. Dispositif de commutation (10) pour un appareil de mesure (30) pour un transformateur, comprenant des premiers moyens de commutation (14) commandables, lesquels sont conçus pour court-circuiter des raccords (11) respectivement associés d'un bobinage d'une pluralité de bobinages du transformateur, dans lequel un signal d'essai d'une source de signaux de l'appareil de mesure (30) doit être fourni à l'un des raccords (11) du bobinage, et de seconds moyens de commutation (14, 17, 20) commandables, lesquels sont conçus pour connecter en série le bobinage à un autre bobinage de la pluralité de bobinages du transformateur.
  2. Dispositif de commutation selon la revendication 1,
    caractérisé par
    d'autres premiers moyens de commutation (17) commandables, lesquels sont conçus pour fournir au raccord (11) du bobinage une première grandeur électrique devant être mise à disposition par l'appareil de mesure (30), en particulier une tension dans la plage de 0 V jusqu'à quelques kV, comme signal d'essai.
  3. Dispositif de commutation selon la revendication 1 ou la revendication 2,
    caractérisé par
    d'autres seconds moyens de commutation (20) commandables, lesquels sont conçus pour prélever d'un raccord (11) associé respectif d'encore un autre bobinage de la pluralité de bobinages une seconde grandeur électrique devant être détectée par l'appareil de mesure (30) comme signal de mesure.
  4. Dispositif de commutation selon la revendication 2 et la revendication 3,
    caractérisé en ce
    que les autres premiers et seconds moyens de commutation (20) commandables peuvent être commandés par un signal de commande devant être mis à disposition par l'appareil de mesure (30).
  5. Dispositif de commutation selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce
    que les premiers moyens de commutation (14) commandables sont conçus pour court-circuiter les raccords (11) associés du bobinage du côté secondaire de la pluralité de bobinages avec une résistance ohmique inférieure à 10 Ω, de préférence inférieure à 1 Ω et encore plus préférablement inférieure à 1 mΩ.
  6. Dispositif de commutation selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce
    que les premiers moyens de commutation (14) commandables sont conçus pour court-circuiter les raccords (11) associés du bobinage du côté primaire de la pluralité de bobinages avec une résistance ohmique de moins de 50 % d'une résistance de bobinage de celui-ci, de préférence inférieure à 1 Ω, et encore plus préférablement inférieure à 1 mΩ.
  7. Dispositif de commutation selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce
    que les premiers moyens de commutation (14) commandables sont en outre conçus pour court-circuiter deux fois les raccords (11) associés d'un bobinage par l'intermédiaire d'un transformateur.
  8. Dispositif de commutation selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce
    que les premiers et seconds moyens de commutation (14) commandables peuvent être commandés par un signal de commande devant être mis à disposition par l'appareil de mesure (30).
  9. Dispositif de commutation selon l'une quelconque des revendications 1 à 8,
    caractérisé en ce
    que la pluralité de bobinages du transformateur comprend au moins un bobinage partiel du transformateur.
  10. Dispositif de commutation selon l'une quelconque des revendications 1 à 9,
    caractérisé en ce
    que le dispositif de commutation est conçu pour fonctionner avec un transformateur configuré comme convertisseur de tension,
    tous les moyens de commutation (14) commandables comprennent de préférence respectivement des interrupteurs de puissance.
  11. Dispositif de test pour tester un transformateur, comprenant
    le dispositif de commutation (10) selon l'une quelconque des revendications 1 à 10 et l'appareil de mesure (30) pour le transformateur.
  12. Dispositif de test selon la revendication 11,
    caractérisé en ce
    que l'appareil de mesure (30) est conçu de telle sorte qu'il génère le signal d'essai et le fournit au dispositif de commutation (10), pour appliquer le signal d'essai sur le transformateur par l'intermédiaire du dispositif de commutation (10), et
    en ce que l'appareil de mesure (30) est conçu de telle sorte qu'il reçoit un signal de mesure du transformateur par l'intermédiaire du dispositif de commutation (10) et l'évalue.
  13. Dispositif de test selon la revendication 12,
    caractérisé en ce
    que l'appareil de mesure (30) comprend une source de signaux pour la génération du signal d'essai et une unité d'évaluation pour l'évaluation du signal de mesure,
    dans lequel le dispositif de commutation (10) est intégré dans l'appareil de mesure (30).
  14. Procédé (50) permettant de faire fonctionner un dispositif de commutation (10) pour un appareil de mesure (30) pour un transformateur, comprenant les étapes :
    de court-circuitage de raccords (11) respectifs associés d'un bobinage d'une pluralité de bobinages du transformateur à l'aide de premiers moyens de commutation (14) du dispositif de commutation (10), dans lequel un signal d'essai d'une source de signaux de l'appareil de mesure (30) est fourni à l'un des raccords (11) du bobinage, et
    de connexion en série du bobinage à un autre bobinage de la pluralité de bobinages du transformateur à l'aide de seconds moyens de commutation (14, 17, 20) du dispositif de commutation (10).
  15. Procédé (50) selon la revendication 14,
    dans lequel le procédé est exécuté au moyen du dispositif de commutation (10) selon l'une quelconque des revendications 2 à 10 ou du dispositif de test (40) selon l'une quelconque des revendications 11 à 13.
EP16728018.9A 2015-06-15 2016-06-09 Dispositif de commutation, dispositif de test et procédé pour faire fonctionner un dispositif de commutation pour un appareil de mesure pour un transformateur Active EP3308179B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT504862015 2015-06-15
PCT/EP2016/063143 WO2016202673A1 (fr) 2015-06-15 2016-06-09 Dispositif de commutation, dispositif de test et procédé pour faire fonctionner un dispositif de commutation pour un appareil de mesure pour un transformateur

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Publication Number Publication Date
EP3308179A1 EP3308179A1 (fr) 2018-04-18
EP3308179C0 EP3308179C0 (fr) 2023-10-11
EP3308179B1 true EP3308179B1 (fr) 2023-10-11

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US (1) US10746810B2 (fr)
EP (1) EP3308179B1 (fr)
KR (1) KR101963359B1 (fr)
CN (1) CN107912059B (fr)
AU (1) AU2016278682B2 (fr)
BR (1) BR112017024223B1 (fr)
CA (1) CA2985127C (fr)
ES (1) ES2962459T3 (fr)
MX (1) MX2017014518A (fr)
PL (1) PL3308179T3 (fr)
RU (1) RU2686447C1 (fr)
WO (1) WO2016202673A1 (fr)
ZA (1) ZA201707669B (fr)

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WO2016202673A1 (fr) 2015-06-15 2016-12-22 Omicron Electronics Gmbh Dispositif de commutation, dispositif de test et procédé pour faire fonctionner un dispositif de commutation pour un appareil de mesure pour un transformateur
KR101993785B1 (ko) * 2017-12-29 2019-09-30 (주)영인바이오텍 트랜스 검사 장치
CN110927649A (zh) * 2019-12-02 2020-03-27 云南电网有限责任公司玉溪供电局 一种电压互感器模块化检定装置
CN112748371B (zh) * 2020-12-18 2024-03-12 国网福建省电力有限公司检修分公司 变压器试验多测试项目的通用测试结构及逻辑控制方法

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ZA201707669B (en) 2018-08-29
MX2017014518A (es) 2018-03-15
ES2962459T3 (es) 2024-03-19
AU2016278682B2 (en) 2019-03-14
EP3308179A1 (fr) 2018-04-18
BR112017024223A2 (pt) 2018-07-17
CA2985127C (fr) 2022-09-06
KR20180023894A (ko) 2018-03-07
AU2016278682A1 (en) 2017-11-30
EP3308179C0 (fr) 2023-10-11
CN107912059B (zh) 2021-01-05
US10746810B2 (en) 2020-08-18
BR112017024223B1 (pt) 2022-11-01
RU2686447C1 (ru) 2019-04-25
US20180143236A1 (en) 2018-05-24
CN107912059A (zh) 2018-04-13
WO2016202673A1 (fr) 2016-12-22
PL3308179T3 (pl) 2024-02-19
KR101963359B1 (ko) 2019-03-28
CA2985127A1 (fr) 2016-12-22

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